Improvement in machine for dressing millstones



, 1- S- CARR- vDressing Millstones.

. 'Patented Dec. 14, 1869.

dnitrdctatm l yaient N (itiijiw.

y shown in iig; 1.

as; cana, vor ALLIANCE, onto.

Letters Patent No. 97,878, dated December14, 1869.

l I v l nvrrnox YEMEN-1' IN MACHINE Fon DRESSING MILLSTQNBS.

\ The VSchedule referred to in these Letters Patent and making part of the same.

To all whom 'it may con-cem Beit knownthat I, J. S. CARR, of Alliance," in the i y countyof Stark, and State of Qhio, have invented newv and useful Improvements in Machines for Dressin Millstoues; and I do hereby declare that the following is a full, clear, and exact description of my invenp tion, reference-being had tothe accompanying draw- `ings,-fo1n1ing a part of this specifieatiomnand to the `letters of reference marked thereon, of which drawingsl j Figure 1 is an elevation' of my improved machine.

Figure 2,is aplan of the same. The nature of my invention consists in so construct.-

` ing a machine for dressing millstones, as thatthe rotation of the shaft, which'impart-s a reciprocating Inovef ment tothe pick, shall also canse a curvilinear movement of said pick, as is hereinafter shown, whereby I am enabled to dress the stone with a curvilinear dress, in aplicapand electual manner, by a mechanical operation which involves but little skill'on the part of the operator, the principal care being in placing the machine on the stone, in a proper position for cutting the grooves in-the correct place to form the desired dress.

'lo enable others-skilled in the art to make and use my invention, I will proceed to describe-its construction and operation.

N represent-s the platforro'of the machine; the front endof which is supported by a roller, Z, as shown This roller is arranged in arms d (l, andn has the ratchet-wheelYon the end ot one of its axlefpin's, andl theV lever X, with pawl c, is also pivoted`- on said axlepin, so that by raising the lever X, the roller Zismade to revolve, and the machine is moved forward. l

The circular toothed gear-rim M is fastened on the platform N, and inside of it is arranged the turn-table O, which is. secured in position by theaxial-bolt P, as

In this turn-table O are secured the standards A A,

(the front one of which is Vbroken away'in iig. 1, to

y show the arms of the pickshaft,) which are vunitedl at their upper ends by the cross-bar B, (not showni fig. 2,) and in front of these standards Aare secured the pick-shaft standards W W', `as shown. f

The pick-shaft S is pivoted, between the standards W W,`by` the pivot-bolts f f, which are clamped in i any desired position by the screws g g. p

The pick-arm Q,which has the pick'R secured in a.

hole near its outer end in any suitable manner, is securedjn a slot in the pick-shaft by the clamp-screw e,

so that bylooseningfsaid screw, the pick-arm may be moved in or out, thus changing the distance between the pick and pick-shaft, and, consequently, the radius of curvature. of the groove formed by thc pick, as desired.

The recoil-spring V is fastened to a block on the turn-table O, in such a manner as to cause the pickarm Q to strike ou it at each blow, thus insuring an immediate recoil of the pick after each blow, and pre- Venting a dead-stroke of the pick, which is liable to break the pick and injure the stone.

The tilting-arm T and the spring-arm U are4 attached to the pick-shaft S, as shown, and a cord or chain, D, is secured to the end of the spring-arm U, the'othe-r end of said cord or chain being secured to the end of the lever C, which is pivoted by a bolt, a,

ou the standard A, as shown.

The shaft H is arranged in boxes, k lr, secured on the standards A A, and has the crank I secured at its end, as shown. y

On this shaft is secured the fly-'wheel J, provided with one or more tappets, b b, and the worm h, as shown in fig. 2.

The shaft F is arranged so as to move up and down, and to turn in the arms I E, which are secured to the standard A, ,(the `arm E being removed in fig'. 2, for sake vof clearuess in drawing,) and it is supported at the proper height by a collar, K, which rests on the arm l.

'The pinion L is'secu'red at the lower end of the shaft F, and meshes into the xed gear-rim M, as shown in fig. 1, and the worm-wheel G is also secured on this shaft, and engages with the worm h on vthe driving-shaft H, as shownin iig. 2.

The mode of adjusting and operating this machinewill be easily understood after the foregoing'description of its construction.

The pick R is so adjusted that the distance between ,it and the centre l of the turn-table O, shall be equal to the radius of curvature of the groove desired to be cut, and the machine is then placed on the stone, in such Va position as that the pick 1t would move over the required groove in thest'one.

Then, by turning the crank I, the revolutions of the fly-'wheel J cause the tappets b b to force' down lthev end of the tilting-arm T, which raises the pick R, and, as the tappet b slides off the arm T, the pick R is dropped,l and a blow of the pick on the stone is attained.

In order to increase the force of thisl blow to any desired extent, it' is only necessary to draw down the leverC, which tightens the, the chain D, and brings the action ofthe springarmU into play, as is readily seen. l t

causes a slow rotation of the shaft F, which causes the The rotation ot' the worm h on the driving-shaft H,

turn-table Oto turn slowly around t-he axial-pin,P, by reason of the action of vthe pinion L on the xed gear-rim M, and this rotation of the turn-table causes the progressive movement of the pick R along the groove to be cut, as is readily seen. l

By raising the shaft F, the pinion L and wormwheel G may be throivn out of' gear with the fixed gear-rim M and worm 7l, when the pick R can be turned to pick at any desired point, or by fastening the turn-table 0 so as to prevent its turning, the machine maybe nsed for forming straight grooves,

Vthe forward movement of the machine, and, consequently, of the pick R, being obtained by the movement of the lever X, and its consequent action through the pawl c, on the ratchet-wheel Y and roll/er Z, as before described.

Having thus fully described my invention7 VVha-t I claim therein as new, and desire to secure by Letters Patent, is-

1. A'machine for dressing millstones, constructed substantially as described, so th'at the rotation of the driving-shaft, which imparts a reciprocating movement to the pick, shall also cause a carvilinear movement of' said piek, substantially as is herein specified.

2. The platform N, provided with the fixed gearrim M, and turn-table O, substantially as and for the purpose specified.

3. The spring-arm U, when used in combination with the pick-shaft S, for the purpose of regulating the intensity ofthe blows given by the pick, substantially as is herein specified.

4. 'lhe combination of' the pick-shaft S, with pickarm Q and spring-.arm U, cord or chain D, and lever caen;

C, the several parts being arranged substantially as and for the purpose specified.

l 5. The arrangement of the shaft F provided with pinion L and Worm-wheel G, in the standards E l, so that it may be slid up and down, for the purpose of throwing said pinion and Worm-wheel out of gear with the fixed gear-rim M and Worm h, substantially as is herein specified.

6. The combination of the piek-shaft S, provided with pick-arm Q and tilting-arm T, fly-wheel J with tappets b b, shaft H with worm h, shaft F with wormwheel G and pinion L, and fixed gear-rim M, the sev- -eral parts being arranged substantially as and for the purpose specified.

7 The combination of shaft H provided with the crank I and fiy-wheel J, with tappets b b, pick-shaft S- with pick-arm Q, tilting-arm T, and spring-arm U, cord or chain D, and lever C, the several parts being arranged substantially as'and for the purpose specified.

8. The combination of the fixed gear-rim M, shaft with pinion L and worm-wheel G, shaft H, with worm h, and fly-wheel J with tappets b b thereon, pick-shaft S with tilting-arm T, spring-arm U, and piek-arm Q, cord or chain D, and lever O, the several parts being arranged substantially as and for the purpose specified:

As evidence that I claim the foregoing, I have hereunto set my hand, in the presence of two witnesses, this 4th day of August, 1869.

J. S. GARR.

Witnesses:

RUTH K. ABBOTT, JoB ABBOTT. 

